Study of Pyridoxal Phosphate for Treatment of Seizures in Patients with PNPO Deficiency

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What is this study about?

This study involves patients with a rare condition called Pyridox(am)ine 5′-Phosphate Oxidase (PNPO) deficiency, which causes seizures that are sudden episodes of uncontrolled electrical activity in the brain. The treatment being studied is MC-1, which is a tablet form of pyridoxal phosphate, a substance that the body normally makes from vitamin B6. People with this deficiency cannot produce enough of this substance on their own, which leads to seizures. The study will also use other antiepileptic medications, which are drugs used to prevent or control seizures.

The purpose of this study is to find out if MC-1 works well for long-term treatment of patients who have confirmed PNPO deficiency. Patients taking part in the study will receive MC-1 tablets by mouth over a period of up to one year. The study will look at whether this treatment helps control seizures and reduces the risk of death compared to patients who do not receive any treatment with pyridoxal phosphate. The study will also track how often seizures occur during the treatment period.

During the study, patients will take MC-1 tablets multiple times daily, similar to how they may have been taking other forms of this vitamin before. The treatment can last up to 52 weeks, with a maximum daily dose of 3 grams. The study is designed for patients aged 2 years and older who have had their condition confirmed through genetic testing and whose seizures are usually controlled with oral treatment.

1 Treatment with MC-1 tablet

During this study, you will receive MC-1, which contains pyridoxal phosphate as the active substance. This medication is designed to help control seizures in patients with PNPO deficiency, a rare genetic condition that affects how the body processes certain forms of vitamin B6.

The medication will be provided in tablet form and will be taken by mouth.

You will receive MC-1 as a chronic treatment, meaning it is intended for long-term use to manage your condition.

The study does not specify the exact dosage or frequency of administration in the available information. Your treating physician will determine the appropriate dose for you based on your individual needs.

2 Study participation period

The study will evaluate how well MC-1 works for the chronic treatment of your condition over a period of time.

The main evaluation point will occur at 12 months after you begin treatment.

During this time, the study will monitor important health outcomes and the frequency of seizures you may experience.

3 Monitoring during the study

Throughout the study, your health status will be monitored, including any seizures that may occur.

The study will track the frequency of seizures, including any severe or prolonged seizure episodes.

Your overall health and response to the treatment will be assessed during the study period.

Who Can Join the Study?

You must have confirmed PNPO deficiency, which is a rare genetic condition that affects how the body processes certain forms of vitamin B6, confirmed through genetic testing (a test that looks at your genes or DNA)
Your seizures (sudden uncontrolled electrical activity in the brain causing changes in behavior, movements, or consciousness) must be typically controlled with P5P (a specific form of vitamin B6 called pyridoxal 5′-phosphate) taken by mouth
You must be taking multiple doses of P5P each day to control your seizures
You must have been receiving P5P treatment for at least 30 days
You can be male or female
You must be 2 years of age or older
You can participate if you previously tried pyridoxine (another form of vitamin B6) and it did not work for you, as long as you have stopped taking pyridoxine for at least 24 hours
You must provide written permission to participate in the study, or if you are under 18 years old, your parent or guardian must provide written permission on your behalf

Who Cannot Join the Study?

The source data does not provide specific exclusion criteria for this clinical trial
If you are interested in participating, the research team will need to review your complete medical history to determine if you can safely take part in this study
General factors that might prevent participation could include other medical conditions, certain medications you are taking, or other health concerns that need to be evaluated by the study doctors

Where you can join this trial?

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Verified Sites

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Other Sites

Site Name	City	Country
Instytut Centrum Zdrowia Matki Polki	Lodz	Poland
Wroclaw Medical University	Wroclaw	Poland
Uheejmnthzuwwt Cfctjzx Kfelbvieo	Gdansk	Poland

Trial status

Country	Status	Recruitment Start
Poland	Recruiting	01.11.2025

Trial locations

MC-1 is an oral medication being tested for the treatment of PNPO deficiency. PNPO deficiency is a rare genetic condition that affects how the body processes vitamin B6, which is important for brain function. This medication is designed to help manage the symptoms of this condition when taken by mouth over a long period of time.

Investigated diseases:

Seizure

Pyridox(am)ine 5′-Phosphate Oxidase Deficiency – A rare genetic disorder caused by mutations in the PNPO gene, which affects the body’s ability to produce an enzyme needed to convert vitamin B6 into its active form. Without this enzyme, the brain cannot properly produce important chemical messengers that help nerve cells communicate. The condition typically appears in newborns or early infancy, though it can sometimes develop later. Affected individuals experience seizures that begin soon after birth and do not respond to standard seizure medications. The seizures can be of various types and may occur very frequently, sometimes progressing to prolonged seizure episodes. This enzyme deficiency disrupts normal brain development and function, leading to ongoing neurological problems if not properly managed.

Trial ID:

2025-522346-46-00

Protocol code:

16002

Trial Phase:

Therapeutic confirmatory (Phase III)

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Study of Pyridoxal Phosphate for Treatment of Seizures in Patients with PNPO Deficiency

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